High-power, single longitudinal mode, single-polarization beam generates from a polarization maintaining double-clad
Yb-doped silica fiber laser is more applicable for inertial confinement fusion (ICF) applications. The laser beamlets that
converge on a target originate from a low power fiber laser in the master oscillator room (MOR). The laser seed signal
amplifies through several cascaded amplifier chains in the front-end system. Today, the most famous fusion facilities,
including National Ignition Facility (NIF) at Lawrence Livermore National Laboratory (LLNL), Ligne d’Intégration
Laser- Laser Mégajoule (LIL-LMJ) and OMEGA utilize fiber-based lasers. In this paper, we have compared various
pumping modes comprising end-pumped master oscillator-power amplifier (MOPA) configuration and distributed sidepumped
multifiber series fiber laser for scaling up the power of large-mode area (LMA) Yb:silica fiber laser for forward
pumping regime.
In this work, an exact numerical analysis of an end-pumped continuous-wave (CW) double-clad fiber laser with linearcavity
design has been intensively carried out based on a set of propagation rate equations including loss coefficients.
Following the theoretical analysis of the rate equations describing pump coupling, fiber end-face cleaving (air
reflection), splice points, combiner, fiber Bragg gratings (FBGs) and scattering losses, a comparison has also been made
between the numerical predictions and the experimental results due to a typical single-mode ytterbium (Yb)-doped silica
rectilinear fiber laser.
In this work, an exact numerical analysis has been made for rate equations of continuous-wave (CW) cladding-pumped
fiber amplifier. A comprehensive form is considered including the pump coupling efficiency, splice points and scattering
losses.
Moreover, we have focused on determination of the small-signal gain and the saturation power for a typical single-stage
large-mode area (LMA) Yb-doped silica fiber amplifier based on the steady-state amplification relation. The dependency of
those parameters to the pump power is investigated which is significantly due to the signal power filling factor.
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